Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in ∆R and R over the last 3000 years

Petchey, Fiona, and Ulm, Sean (2012) Marine reservoir variation in the Bismarck region: an evaluation of spatial and temporal change in ∆R and R over the last 3000 years. Radiocarbon, 54 (1). pp. 45-58.

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Abstract

Interactions between islands, ocean currents, and winds cause large-scale eddies and upwelling in the lee of islands that can result in spatial variation in the marine radiocarbon reservoir. For waters around New Ireland and the Bismarck Sea, ∆R values ranging from 365 to –320 14C yr have been reported (Kirch 2001; Petchey et al. 2004). Petchey et al. (2004) proposed that some of this variation was caused by seasonal reversals in the South Equatorial Current and North Equatorial Counter Current system, combined with Ekman upwelling from the Equator. McGregor et al. (2008) suggested additional complexity within this region caused by a change in the reservoir value over time in response to changing climatic conditions. We present a series of 14 new and extant published ∆R and R values on historic shells, combined with 8 values from archaeological terrestrial/marine pairs and U-Th dated coral, that support observations of localized variability caused by a complex interplay between seasonal currents, riverine input, and ocean eddies. On the basis of these values and oceanographic data, we divide the Bismarck Sea surface marine 14C reservoir into 6 tentative subregions. In particular, our results support significant variation within channels at the southwest and southeast ends of New Britain and towards the equatorial boundary of the sea. Our results indicate that within the Bismarck Sea geographical variation appears to be more extreme than temporal over the last 3000 yr.

Item ID: 21868
Item Type: Article (Refereed Research - C1)
Keywords: archaeology, Pacific archaeology, coastal and island archaeology, Bismarck Sea, radiocarbon, marine reservoir correction, Lapita, archaeometry
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This work is licensed under a Creative Commons Attribution 3.0 License.

ISSN: 0033-8222
Date Deposited: 08 May 2012 05:04
FoR Codes: 21 HISTORY AND ARCHAEOLOGY > 2101 Archaeology > 210102 Archaeological Science @ 75%
21 HISTORY AND ARCHAEOLOGY > 2101 Archaeology > 210106 Archaeology of New Guinea and Pacific Islands (excl New Zealand) @ 25%
SEO Codes: 95 CULTURAL UNDERSTANDING > 9505 Understanding Past Societies > 950599 Understanding Past Societies not elsewhere classified @ 100%
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